Merge pull request #42 from daltonclaybrook/dalton/xc-settings

Add ability to provide arbitrary Xcode build settings

Author: bok-

Sources/CreateXCFramework/BuildSetting.swift

@@ -0,0 +1,24 @@
+//
+//  BuildSetting.swift
+//  swift-create-xcframework
+//
+//  Created by Dalton Claybrook on 4/17/21.
+//
+
+import ArgumentParser
+
+/// A representation of a build setting in an Xcode project, e.g.
+/// `IPHONEOS_DEPLOYMENT_TARGET=13.0`
+struct BuildSetting: ExpressibleByArgument {
+    /// The name of the build setting, e.g. `IPHONEOS_DEPLOYMENT_TARGET`
+    let name: String
+    /// The value of the build setting
+    let value: String
+
+    init?(argument: String) {
+        let components = argument.components(separatedBy: "=")
+        guard components.count == 2 else { return nil }
+        self.name = components[0].trimmingCharacters(in: .whitespacesAndNewlines)
+        self.value = components[1].trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+}

Sources/CreateXCFramework/Command+Options.swift

@@ -37,6 +37,9 @@ extension Command {
         @Option(help: "The path to a .xcconfig file that can be used to override Xcode build settings. Relative to the package path.")
         var xcconfig: String?
 
+        @Option(help: ArgumentHelp("Arbitrary Xcode build settings that are passed directly to the `xcodebuild` invocation. Can be specified multiple times.", valueName: "NAME=VALUE"))
+        var xcSetting: [BuildSetting] = []
+
 
         // MARK: - Output Options
 

Sources/CreateXCFramework/XcodeBuilder.swift

@@ -115,13 +115,18 @@ struct XcodeBuilder {
             "SKIP_INSTALL=NO"
         ]
 
-        // add any build settings
+        // add SDK-specific build settings
         if let settings = sdk.buildSettings {
             for setting in settings {
                 command.append("\(setting.key)=\(setting.value)")
             }
         }
 
+        // add build settings provided in the invocation
+        options.xcSetting.forEach { setting in
+            command.append("\(setting.name)=\(setting.value)")
+        }
+
         // add our targets
         command += [ "-scheme", target ]